package com.onaro.sanscreen.client.view.tabular;


import java.util.EventListener;

import com.onaro.util.ListenerList;


/**
 * Allows other components to track changes in the grouping model
 */
public interface GroupingConfigListener extends EventListener {

    /**
     * Invoked whenever grouping configuration changes.
     * @param event describe the change in the grouping
     */
    public void configChanged(GroupingConfigEvent event);

    /**
     * Register an event firer with the <code>ListenerList</code> utility for this listener.
     */
    final static FireEvent firer = new FireEvent();
}

/**
 * Used for sending event to <code>GroupingConfigListener</code>s by the
 * <code>ListenerList</code> utility.
 */
class FireEvent implements ListenerList.FireEvent<GroupingConfigListener, GroupingConfigEvent> {
    FireEvent() {
        ListenerList.addFireEvent(GroupingConfigListener.class, this);
    }

    public void fire(GroupingConfigListener listener, GroupingConfigEvent event) {
        listener.configChanged(event);
    }
}